Atomic Physics
Atomic and molecular structure, spectra, collisions, and data. Atoms and molecules in external fields. Molecular dynamics and coherent and optical control. Cold atoms and molecules. Cold collisions. Optical lattices.
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A QED Coulomb calculation predicts bound and resonant states from −30 to −1 eV, a clean analog of tetraquark physics.
· “Trilepton and tetralepton bound and resonant states: the QED counterpart of multiquark states”
Purcell-enhanced emission lets a neutral-atom node tell bright from dark states in 200 ns, not hundreds of microseconds.
· “Ultrafast high-fidelity state readout of single neutral atom”
Axial constructive interference makes a linear ion crystal act as a directional free-space light collector.
· “Coherent enhancement of collection of light from linear ion crystals”
Precise isotope-shift calculations benchmark the corrections needed to extract Vud from superallowed beta decays.
A variational circuit on Rydberg-dressed atom arrays prepares better squeezed states for clocks despite noise.
· “Variational spin-squeezing algorithms on programmable quantum sensors”
STIRAP's never-populated middle state makes it a portable control tool from molecules to quantum circuits.
Boron and nitrogen substitutions split degenerate vibrations and tie phonon angular momentum to electron affinity.
Ultracold NaCs pairs live seconds with dipolar strength tunable from zero to about 20,000 Bohr radii.
· “Extreme Loss Suppression and Wide Tunability of Dipolar Interactions in an Ultracold Molecular Gas”
Relativistic reanalysis of 1967 atomic-beam data raises B by 1.7% and aligns Q with few-body results.
· “Revisiting the hyperfine interval for the 2s2p ³\!P_(J) state in ⁹Be”
Fifty years untested; the new fit puts the constant near zero, sharpening mercury clocks and EDM searches.
· “The hyperfine anomaly in mercury and test of the Moskowitz-Lombardi rule”
High-resolution spectra also pin the 35.5-keV transition's penetration parameter at -1.2(6), a small negative anomaly.
· “High-resolution conversion electron spectroscopy of the 125I electron-capture decay”
At 0.2–0.7% uncertainty, the new Xe-129 sensitivity coefficients would turn future EDM runs into sharper tests of CP violation.
Extended formalism extracts dimer–particle scattering, including a deuteron–triton toy model.
Simulated broadband microwave readout needs no bias field or frequency sweep.
· “Magnetometry with Broadband Microwave Fields in Nitrogen-Vacancy Centers in Diamond”
A generalized Gauss-Bonnet theorem turns shear angle into a coordinate-free gravity probe.
· “Atom Interferometer Phase Shear and Spacetime Sectional Curvature”
Dual microwave shielding tames collisions and tunes dipolar interactions from gas to self-bound droplet.
· “Bose-Einstein condensate of ultracold sodium-rubidium molecules with tunable dipolar interactions”
More frequent 509 nm pulses keep more cesium atoms in Rydberg states, sharpening weak-signal RF detection.
Site-selective field gradients and lifetimes provide the material data needed to build solid-state nuclear clocks.
Beam gradients reach sparse axial modes, keeping gates near 0.97 fidelity in chains up to six ions.
· “Scalable entangling gates on ion qubits via structured light addressing”
A validated MOT solver sets shock onset near an effective charge squared of 0.36, opening tabletop analog studies.
Trained on a fraction of hand-labeled events, it resolves charge state and atomic number in hours, not months.
A gap-protected countertwisting protocol recovers all-to-all sensitivity for 2D dipolar and 3D van der Waals systems.
· “Squeezing Towards the Heisenberg Limit with Locally Interacting Spins”
In a pancake rubidium condensate, the vortex ground state survives only below a critical acceleration of 0.1625g.
· “Microgravity-assisted off-axis spin vortex in a ⁸⁷Rb dipolar spinor Bose-Einstein condensate”
The 1203.35 nm Sr V line is a strong, density-sensitive candidate for tracking strontium ionisation in a kilonova.
Switching Rydberg states in a rubidium focused ion beam cut energy spread from 23 to 12 eV, a path to sharper focus.
· “Selective ionization of Rydberg atoms to reduce the energy spread of a cold atom focused ion beam”
One-hertz measurements on a handful of transitions would cut mass-ratio and triton-radius uncertainties by 100 to 250 times.
Levitating droplets follow predicted dynamics and trap abruptly, unlike rolling ball bearings.
In 87Rb, the inverted Doppler-free resonance matches the dual-frequency scheme's contrast, reaching 3e-13 at 1 s.
· “Single-frequency inverted Doppler-free resonance as a platform for chip-scale optical clock”
In modulated-light clocks, hyperfine-frequency beats among off-resonant laser lines can outweigh the usual Stark shift.
Benchmark on 791 color centers: Huang-Rhys factors and lineshapes match DFT within about 12 percent.
· “Accelerating point defect photo-emission calculations with machine learning interatomic potentials”
Reply shows phase shift depends on g even without levitation.
· “Reply to comment on: Observation of the quantum equivalence principle for matter-waves”
Fluorescence of laser-prepared rubidium atoms reconstructs beam position, width, and current from one camera sweep.
· “Electron beam characterization via fluorescence imaging of Rydberg states in atomic vapor”
A same-setup argon comparison maps which driver wins at each photon energy from 14 to 40 eV.
Two-step Ti:Sa laser scans map Rydberg states and an autoionizing resonance that powers radioactive Cr beams.
· “Two-step laser resonant ionization spectroscopy of chromium”
The C9 tables cover groups I, II, and XII atoms and ions, giving cold-atom and hybrid-trap models numbers they did not have.
The line's crossing with another beam's line locates the true null in one scan.
· “Radio-Frequency Pseudo-Null Induced by Light in an Ion Trap”
Zero-delay photon correlation near 0.003 breaks the classical bound; many-atom spectra stay classical.
· “Theory of quantum optics and optical coherence in high harmonic generation”
A 1-second probe, a redesigned trap, and a new vacuum system carry it past every previous accuracy mark.
· “High-Stability Single-Ion Clock with 5.5times10⁻¹⁹ Systematic Uncertainty”
At shallow depth, two slightly detuned lattices act as one stable lattice with a spacing set by their beat note.
· “Long-wavelength optical lattices from optical beatnotes: theory and applications”
Fission-fragment thermalization in helium shows yield ratios varying between isotopes and nuclear isomers, beyond known isotope effects.
· “Anomalous nuclear effects on ion charge state distribution in helium gas”
Overcritical regime is reachable, and tighter focusing beyond an optimum lowers the yield.
One-electronvolt shifts would fix the isovector parameter and aid neutron-antineutron oscillation searches.
Shallow-trap loading plus deep-trap holding yields a 79% filling fraction without atom rearrangement.
Coherent pair rotations, 3-second Ramsey fringes, and parallel field sensing all follow from one quadratic energy shift.
· “Coherent control over the high-dimensional space of the nuclear spin of alkaline-earth atoms”
One resonant beam at 456 nm produces 852 nm fluorescence at about 1 percent efficiency, making a simple down-converter.
· “Blue laser induced bright red fluorescence in hot cesium vapor”
Near-perfect, 0.1 ms transfer at a 'sweet spot' between three trapped strontium atoms.
· “Transferring vibrational states of trapped atoms via a Rydberg electron”
Tuning the electron energy through autoionizing states reveals spin effects blocked in ordinary scattering.
· “Electron polarization in the resonant inelastic scattering on hydrogen-like ions”
Resonance curves and autoionization widths fill the missing molecular data for NH+ dissociative recombination.
· “Rydberg states and new resonant states of the imidogen molecule NH: pathways for nitrogen release”
Hologram-computing network replaces serial assembly, making defect-free multi-thousand-atom arrays routine.
A 20-mm chip with one laser beam cools both Rb and Cs toward precision clocks and sensors.
Adding two-photon loss turns a runaway instability into coexisting normal and superradiant steady states.
· “Dissipative Phase Transition in the Two-Photon Dicke Model”
A Bayesian optimizer that probes sparse regions tunes cold atoms to near-recoil temperatures in minutes, not hours.
Inelastic scattering of one trapped rubidium atom yields S=2.61, a spin-free route to entangled photons for quantum networks.
· “Purcell-Enhanced Generation of Photonic Bell States via the Inelastic Scattering of Single Atoms”
A 4 K cryopump and <50 K walls give vacuum-limited trapping plus coherent Rydberg control in one high-optical-access platform.
· “A high optical access cryogenic system for Rydberg atom arrays with a 3000-second trap lifetime”
Simulations show ±100-attosecond delay and advance patterns that survive orientational averaging and can be seen by pump-probe chronoscopy.
· “Diffraction patterns in attosecond photoionization time delay”
Frequency shifts reduce the pairing ratio and rate; a stronger coupling field restores them.
· “Frequency-tunable biphoton generation via spontaneous four-wave mixing”
Review: compact magnetometers and spin amplifiers now rival stellar cooling bounds in several mass windows.
· “Searches for exotic spin-dependent interactions with spin sensors”
Ramsey fringes on a 30-atom dysprosium chain show a frequency shift that evolves in time toward the low-excitation collective Lamb shift.
· “Single-atom resolved collective spectroscopy of a one-dimensional atomic array”
Quasibound states of (He-p-mu), (He-d-mu), (Li-p-mu), (Li-d-mu) now have reported binding energies.
· “Resonant states of muonic three-particle systems with lithium, helium and hydrogen nuclei”
Trapped formaldehyde's opposite-rotation states stay coherent and ignore electric field strength.
· “Coherence of Symmetry-Protected Rotational Qubits in Cold Polyatomic Molecules”
Per-atom velocity reconstruction turns thermal positronium and muonium beams into precision interferometers.
· “Two-Photon Optical Ramsey-Doppler Spectroscopy of Positronium and Muonium”
Tuning the phase of a two-color field moves the second electron's most likely momentum off zero.
E1 half-lives yield lab-frame nuclear moments 2-3 orders above single-particle estimates in pear-shaped isotopes.
· “Enhanced nuclear Schiff and electric dipole moments in nuclei with an octupole deformation”
At high excitation, each eigenfunction matches a uniform mix of elliptic orbits with the same $E$, $L$, and $L_z$.
· “How Are Quantum Eigenfunctions of Hydrogen Atom Related To Its Classical Elliptic Orbits?”
Matches full quantum simulation and a 138Ba+ EIT experiment, predicting where cooling flips to heating.
· “Laser cooling trapped-ion crystal modes beyond the Lamb-Dicke regime”
SO(2,1) symmetry protects the mode even at 52% cloud-size excitation; its residual damping matches technical noise.
· “Persistent breather and dynamical symmetry in a unitary Fermi gas”
Comb-calibrated Doppler-free spectroscopy gives the most precise 200Hg-202Hg isotope shift yet: 5295570 ± 15 ± 8 kHz.
· “Comb-referenced Doppler-free spectrometry of the ²⁰⁰Hg and ²⁰²Hg intercombination line at 254 nm”
The 1034-nm dressing beam replaces the usual two-stage MOT sequence for alkaline-earth atoms.
The full 5D rates overshoot by 10 to 100 times; agreement appears only when the anion ends in j=0.
· “Ro-vibrational quenching calculations of C₂^- in collision with H₂”
Feedback that beats the bias field gives harmonics, chaos, and combs; a pulse mode adds a tunable cavity-free comb.
One echo of a scrambling Hamiltonian gives a sensor at η≈2/N, within a factor of two of the Heisenberg limit.
· “A Universal Protocol for Quantum-Enhanced Sensing via Information Scrambling”
A stroboscopic dressing scheme makes effective interactions that no sum of pairwise terms can match.
· “Resonant stroboscopic Rydberg dressing: electron-motion coupling and multi-body interactions”
Direct two-qubit swap is possible with modulated laser pulses, no three-gate decomposition needed.
· “Design fast Rydberg blockade SWAP gates with synthetic modulated driving”
The hadronic correction is far below the 10 kHz precision goal and safe to ignore for the electron-muon mass ratio.
· “Hadronic light-by-light scattering contribution to 1S-2S transition in muonium”
Neon measurements show Coulomb focusing and backscattering at the parent ion beyond the impulse approximation.
Vibration-resolved excitation, attachment, and dissociation data now feed fusion plasma and ion-source models.
· “Vibrational excitation and dissociation of deuterium molecule by electron impact”
Cosine modulation addresses two momentum pairs and sets their relative phase electronically, immune to laser phase noise.
· “Coherent coupling of momentum states: selectivity and phase control”
Multiscale simulation traces the slowdown to hopping-rate drops and hydrogen traps near interstitial oxygen.
· “Effect of Oxygen on Hydrogen Diffusivity in hcp-Zirconium”
Replacing product Gaussian grids with Lebedev or Popov cubatures cuts the grid size needed for hydrogen in crossed fields.
Doubling 1540 nm light in an LBO cavity produces enough power, linewidth, and beam quality for cold-atom experiments.
· “Generation of 14.0W of single frequency light at 770 nm by intracavity frequency doubling”
